Gas-relief valve



July 10, 192s. 1,616,889-

G. DAVIS y GAS RELIEF VALVE Filed April 11. 1925 len 4'seat B2.

elements...

Patented July l0, 1928.

V@EURL-dil C. DAVIS, OF CHICAGO, ILLINOIS, ASSIGNOR T0 G. IVLDAVISREGULATOR COM PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS. Y l

Velias-Ranieri v ALvE.

Application led April 11,

v This invention relates to a relief valve, and particularly to a gasrelief valve. It is intended primarily for use in connection with gaslines through which gascomes from gas wells. It has' for one object toprovide means for opening an extremely `sensitive valve. It has foranother lobject to provide means in a gas supply and transmission linewhereby the gas is not permitted to build up more than a very slightdegree of pressure.

Other objects will appear from time to time throughout thespecification` and claims. I

My invention is illustrated in the accompanying drawing, which isavertical cross section of the valve. y

As shown the valve itself is generally of theV globe type,provided withan upper hous-V ing'A1'into which the'gas or other liquid `flows. It hasank opening in the .top -Af through which the gas may .pass and through.which the pressure vof the" gas lmay be eX- erted. Within the body A of`the valve is a globe B. This globeis provided with a l pair of openingsB1 B1. In each ofthese openings is Vmounted ajremovable .valve The valvemember is formed'bya shaft C tov which are fastened. the two horizontalvvalve discs C1 C1.. Each ofthese discs has downwardly .depending fromita plurality .of webs C2 reinforced throughout a portion of theirheightby acurved skirt C3.

VThe valve body A is provided in itsI bottom with a drain connection Din whichis mounted a removable plug, which may be removed toA permitliquid to be drained from the body of the valve. f

Above thevalve is mounted a. diaphragm vhousing E which is preferablyformed of two sections bolted together. `Above 4this housing E is aprotective. housing F which is removably held in place by means of thenut F1. This upper housing serves ,to protect thevalve'operatingmechanism from the Within the housing 4and vpreferablykgripped betweenl itstwo parts is a diaphragniG. `This diaphragm may beof rubyber orl similar material.; It isv gripped between two holdingplates H, H1. The plate l helical spring P.

1923. `serial No. 631,283.

is a stud I. Screw threaded to thisisa dash Secured This member is.provided with a. lSlot L1 .which as shown is wider at its bottom thanat its top so that the headK1 may slide in the Ylarger lower portionofthe slot L11-and the Shank of ther shaftfK- mayslide inthe smallerupper. portion.A By this means the .valve is heldand supported from theshaft K which'in'turn-is connected with the diaphragm and dash pot, andall of these parts thus rise and fall together. Y Surmounting `thehousing'E and preferably secured to it is a spider M. Mounted centrallyin the spider andadjustablyheld therein by means of a bushingv Nand-nuts N1, N2 is a shaft O. This shaft may bead- .Y shaft O-andbearing at the top on the member J2 and atthe bottom on the disc .Oisa Formed onV the shaft stop serves to" prevent Aexcessive upwardmovement of the ,valve diaphragm and dash pot assembly, which excessiveupward move# ment might displace the valve and preventl proper closing.f

Although I have'shown an operativedeparts might bel made withoutdeparting j materially from the spirit of'my invention,

and IV wish therefore that. myy showing be talrenas in a sensediagrammatic. p The use and operation ofv my-invent-ion.

are as follows: Q y 1 The valve of thisr vapplication'is intended toheused in a gas line where a very shght O a stop i This ,justedvertically up and down .with relation to the spiderflVI.. It carries atlitsbottomfend -a .wide flanged disc O1 whichlies within ythe. dash kpotJ, J1 and fitsloosely therein.

lvice, Ystill it will be obvious `that manyv changes 1n Is1ze,;shape.and .arrangement 'of degree 0:? vacuum @reaction will' normally ofpressure.

Vby means .ofthe springi Correspondingly for opening 'and closing saidvalve element` prevail on one side and the valve will norvinallynbeclosed. On the other side gas is in motion or storage under'pressui'e. y

It is desirable to release the gas and cause it to pass through thevalve when a very Slight desire@ Qtypressue is reached. The valve i-sself opening `and thus serves as a .re-

lief valve to relieve the pressure oi the gas.

as it accumulates in a tank or in the line. It i-s designed to beextremely sensitive and to respond immediately to a very slight YdegreeThe parts areassembled as shownin Figure l, in which position the valveis closed.

' The shaft O carrying the spring and disc is adjusted so that thespring practically'supf ports the Weight of .the valve, and dia phragmand Adash pot assembly. Vhen then the pressure of the gas develops itpasses .intofthe valve-about the globe loecause the valve is stillVclosed and i-s effective upward onthe diaphragm. The spring raises thediaphragm VVwhich holds the dash pot assein .bly and carries thevalvewith it, opening the valve and permitting .the discharge oft gas throughthe line.V The. adjustment of `the spring", `as above noted,j is suchthat the pressure need only besuflicient to raise a` very slightport-ionA of the` Weight of the .valve assembly, since the valve isalmost balanced requires only a very slight drop in pressure to' cau-sethe yvalve to close again to prevent discharge. The valve is Ythus eX-tremely sensitiveand readily responds to very low degrees of" pressureand readily closesfthe moment `that pressure no longer exists.' f Y j sl claim.: v s

1. In` an automatically openingA` valve', a valve casing, arvalveelement therein, means in response to pressure fluctuation Withinsaidjcasing, said means including aY diaphragin adapted tobe raised bythe pressure Within'the valve casing and to carry ,the

valve element with it, there being mounted to rise and vfall With thediaphragmy a dash pot, and in combination With said dash pot a plungersupported iromthe yvalve casing, carrying Within the dash'A pot afresisting plate adapted yieldingly to resist the movementV of thev valveelement, and a spring,

said spring Within said dashpot Aadapted yat oneend to bearvagainst saidresisting plate and at the other against' the interior of saiddash'ppot, saidv spring adapted to 4support l ar portion of the Weightof'the valve element.

' 2. In an automatically"opening valve, a. valvel casing, afvalveelement therein, means for opening and closingsaidvalve element .inresponse to pressure Viuctuation WithinV said casing, saidrmeansincluding a diaphragm adaptedto be raised by the pressure y Within thevalve easing and" to carry the valve element Withit, there being mountedto iise andA fall with the diaphragm a dash pot, and in combination withsaid daslipot a plunger supported from the valve casing,

lcarrying Within the dash pot a resi-sting plate adapted'yie'ldingly toresist the movenient ofthe valve element, and a spring, said springwithin said dash Vpot adapted at one end Vto bear against said resistingplate and at the other against the interior of said dash pot, 'saidspring'aclapted to support a portion. ofthe Weight of thervalve element,and means for varying the tension oi' the spring. 3. .In anautomatically opening valve, a valve casing, a valve element therein,means for opening and closing said valve element in 4 response topressure fluctuation rWithin said casing, said means inclu-ding adiaphragm adapted to be raised by the pressure within the valve casingand to carry the `valve element With it, and diaphragm holding platesone .on either side of saidjdiaphragin,

there being mounted to rise and fallwith i thediaphragm a dash pot, andin combination Withv said dash vpot a plunger supported from rthe valvecasing, carrying `Within the dash pot a resisting plate adaptedyi'eldingly to resist the movement rof the valve element',

andV a spring, said spring Within said dash Y pot adapted at one endtobear against said resisting plate and at the other againstthe interior'of said dash pot, said spring adapted rto support a portion oftheWeijglitof the valve'ele'ment. Y

4, In an automatically'opening valve, a

valve easing, la Vvalve element therein, means c for opening and closingsaid valve element in pot. adapted' at one end to bear against saidresisting platey and at the other against the 'interior of said dashpot, said spring'ad'apted tosupporta portion'of thel Weightof the val'veelement, Vand means for varying the tension of'saidI spring.

5. In an automatic valve, a supporting traine, a plunger and means foradjusting the plunger longitudinally. iii the frame,Y a

housing enclosing the plunger and frame and means including a part ofthe plunger for locking the housing in position toenclose the parts.

6.1n an automatic valve, a frame,a

plunger adjustable thereon and means for locking the plunger in adjustedposition together with a housing and means including a part of theplunger for locking the hous-l ing in place to enclose the frame andplunger.

7 In an automatic valve, an entrance and exit, a reciprocatory Valveelement, means'v for opening and closing said valve element in responseto pressure, said means including a diaphragm, such diaphragm adapted tobe raised in response to pressure Within the valve housing and to raiseWith it the valve element, a dash pot and Va spring, the

spring being adapted to support a large part phragm adapted to be raisedby the pressure Within the valve casing and .to carry the valve elementWith it, there being mountl ed in combination With the diaphragm a dashpot and plunger assembly7 one portion of the assembly being mounted torise and v' fall With'the diaphragm and'another portion being mounted iniixed position with relation to the valve casing, such `dash pot lassembly including a resisting plate adapted to yieldingly resist? themovement of the Valve element and the spring, said spring being Withinsaid dash Vpot and adapted at one end to bear against saidvresistingplate and at the other end against the resistance of the dash pot, saidspring adapted to support a portion of the Weight of the valve element.a

Signed at Chicago, county o'fCOok and State oi Illinois, this 2nd day ofApril, 1923.

eno. o. DAVIS.

